Electrode-holder for electric headlights.



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No. 769,236. I v "PATENTED SEPT. 6, 1904.

M. A. Boss. I ELECTRODE HOLDER EOE E-LEcTElo HEADLIGHTS.

APPLICATION. FILED 001. 15, 1903.

N0 MODEL.

UNTTED STATES Patented September 6, 1904.,

PATENT OFFICE.

MARK A. ROSS, OFCHICAGO, ILLINOIS, ASSIGNOR TO PYLE NATIONAL ELECTRIC HEADLIGHT COMPANY, OF- CHIOAGO, ILLINOIS.

ELECTRODE-HOLDER FjOR ELECTRIC HEADLIGHTS.

SPECIFICATION forming part of Letters Patent No. 769,236, dated September 6, 1904.

I Application filed October 15, 1909:. Serial No. 177,113. (No model.)

To all whom it may concern: Be it known that.I, MARK A. Boss, a citizen of the United States, residing at Chicago, in

the county of Cook and State of Illinois, have invented a new and useful Improvement in Electrode-Holders for Electric Headlights, of which the following is a specification.

My invention relates to an improvement in the construction of holders for the lower relatively stationary electrodes of electric-arc lamps, and more especially of electric headlights for locomotives. I

My object is to provide an improved construction of electrode-holder which will per- Init the ready insertion, adjustment, and removal of the electrode, operate to hold the same with great steadiness, and adjust-itself automatically to grip the electrode with desired firmness while the electrode becomes reduced in diameter from wear in use.

In the drawings, Figure 1 is a broken view showing my improved construction in elevation; Fig. 2, an elevation at a right angle to that in Fig. 1, the'electrodel1older being removed from the clamping mechanism which holds it when in position; Fig. 3, a sectiontaken on line 3 in Fig. 1; Fig. 4, a section on line 4: in Fig. 2, and Fig. 5 a broken section on line 5 in Fig. 1.

A is a stationary arm forming a part of the lamp-frame and terminating in a stationary clamping-jaw a, to which is pivoted a swinging clamp 6, adjustable by means of a setscrew 0.

B is the holder for the electrode 0. The holder is formed with a vertical bar cl, concave along its upper end portion and provided at its lower end portion with an'integral lug 0, having V-shaped edges eto fit into coincident V-shaped sockets in the clamps a 6. At the upper end of the V-shaped edge at one side of the lug is a shoulder 0 upon the bar cl in the position shown is a lug f, through which extends a vertical threaded perforation to receive an electrode-adjusting screw g. On the screwg above the lug f is a lock-nut it, having one wing or lever h.

D is an electrode-clamping lever having perforated ears t', which embrace the bar (Z Formed at all times.

I and engage a bearing-pin 7a, which passes through the bar cl and forms the fulcrum for the lever D. The upper or short arm on of the lever D presents a concave electrode-engaging face Z, and the long Karm aof the le- 'ver extends nearly to the lower end of the bar d. On the lower end portion of the arm at is an inward-extending stud a, and coincident therewith in the bar (Z is a socketd. A coiled spring E, at one end entering the socket d and. at its opposite end surrounding the stud 12,, 'is confined between the bar (Z and long arm n of the lever to press the short arm or clamping-jaw m normally against the bar cZ. The electrode-holder is placed in position in the lamp by passing it downward at its edges 01 into the V-shaped sockets of the clamps a 6 until the shoulder rests against the upper surface of the clamp b, in which position it is held rigidly by tightening the screw 0. This construction insures proper positioning of the holder in its support and close contact between surfaces for the passage of the electric current. The electrode 0, usually a solid copper pencil reduced at both ends, is placed in position by pressing the long arm-of the lever 1) against the resistanceof the spring Eito swing the jaw m away from the bar d and then passing the electrode downward between the jaws until it rests on the upper end of the screw 9-. The spring operates to cause the jaws to clamp the electrode rigidly in place. The electrode may be adjusted as to height by turning the screw g, and after such adjustment the'screw may be held against turning by the lock=nut 7L.

In practice the electrode C wears away both longitudinally and circumferential] y under the intense heat to which it is subjected. Adjustment of the electrode to compensate for its shortening may be effected by the set-screw, as described, and the jaw m may be pressed by the springE against the electrode as the latter decreases in diameter to hold it firmly My improved construction meets the requirements of an electrode-holder for. electric headlights, which owing to the constant jarring in travel make great rigidity of parts a necessity. The construction also places the springE a distance below the electrode, which prevents its being injured by the heat, and the spring is so held in place that it cannot drop out when the electrode is removed.

What I claim as new, and desire to secure by Letters Patent, is

1. An electrode holder for electric arc lamps, comprising, in combination, an upright bar having a concave upper end portion presenting an electrode-clamping jaw, a lever in pivotal relation to said bar having an upper short concave arm presenting an electrodeclamping jaw, and a long arm, a spring confined between said bar and long arm of the lever, and a raising and lowering support for the electrode between said clamping-jaws and spring.

2. An eleetrodeholder for electric arc lamps, comprising, in combination, an upright bar having a concave upper end portion presenting an electrode-clamping jaw, a lever in pivotal relation to said bar having an upper short concave arm presenting an electrodeclamping jaw and a long arm, a spring eonfined between the said bar and the long arm of the lever, a lug upon said bar above said spring, an electrode-adjusting screw working through said lug, and a winged lock-nut on said screw bearing against said lug.

MARK A. ROSS.

In presence of- WALTER N. VVINBERG, M. S. MACKENZIE. 

